Abstract
1. We examined non-adrenergic, non-cholinergic (NANC) stimulation for its stabilizing effect on bronchial smooth-muscle tone with respect to its regulatory power and the effect of variations in neural impulse frequency. 2. The guinea-pig isolated main bronchus (n = 4-12) was pretreated with indomethacin (10 microM) and incubated with atropine (1 microM) and guanethidine (10 microM). Electrical field stimulation (EFS: 1200 mA, 0.5 ms, 240 s) was applied at various levels of tone prior to EFS: first without tone, then at a moderate tone induced by histamine (0.3 microM) and, finally, at a high tone induced by histamine (6 microM). Three different stimulation frequencies (1, 3 or 10 Hz) were used in order to produce moderate to near-maximum contractile and relaxant NANC neural responses. Both the contractile and the relaxant NANC responses were tetrodotoxin-sensitive in the guinea-pig isolated main bronchus (3 Hz). 3. Without tone prior to EFS, NANC activation (1, 3 or 10 Hz) induced a pronounced contractile response. At a moderate level of tone prior to EFS, NANC activation induced a less pronounced contractile response. At the highest level of tone prior to EFS, NANC activation induced a relaxant response. All these NANC responses adjusted the tone towards a similar level and this 'stabilization level' was 56(6)% at 1 Hz, 65(3)% at 3 Hz and 56(5)% at 10 Hz, expressed as a percentage of the maximum histamine-induced (0.1 mM) tone in each airway preparation. 4. There was a difference of approximately 90% of maximum between the highest and the lowest tone level prior to NANC activation.(ABSTRACT TRUNCATED AT 250 WORDS)
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